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0 April 1997 <br /> AGE-NC Project No. 96-0209 <br /> Page 5 of 5 <br /> 5.0. SUMMARY AND CONCLUSIONS <br /> — Based upon results of the soil probing 'investigation, the following is presented for your <br /> consideration: <br /> • Hydrocarbon-impacted soil at the site appears to be limited to depths between 20 and 25 feet. <br /> • The greatest concentrations of hydrocarbons were detected in soil samples collected beneath <br /> the building on-site (probe boring P6). <br /> • Based upon results of soil samples collected from probe boring P5. located near the western <br /> property line of site, it is likely that the impacted soil extends off-site under Kasson Road. <br /> • Based upon the eery limited number of soil samples collected and submitted for analysis, the <br /> — extent and volume of the impacted soil could only be estimated. The estimated extent of <br /> hydrocarbon-impacted soil are depicted in Figure 3 - HjWrocarhon Impacted Soil, <br /> Approximately 1,100 cubic yards of impacted soil are believed to remain at the site. The <br /> mass of benzene remaining in the impacted soil is estimated to be 1.8 x 10'- kilograms. <br /> • No detectable concentrations of hydrocarbons were present in the ground xater samples <br /> collected during the November 1996 investigation, indicating that the remaining the <br /> Y hydrocarbon-impacted soil at the site has not impacted ground water in the area ofthe former <br /> USTS. <br /> • According to a draft Policy FOr bnestigation and Cleanup of Pe'trole'wn Discharges to Foil <br /> and(71.02077 hsWleI- pl'esently undergoing review by the State Water Resources Control Board <br /> and RWQCB, the San Joaquin City Resort site appears to qualify as a"low-risk ground water <br /> site". Therefore, we present this report for site closure consideration. <br /> 6.0. LIMITATIONS <br /> — Our professional services were performed using that do2ree of care and skill ordinarily exctcised by <br /> environmental consultants practicing in this or similar localities. The findings were based upon <br /> analvocal results provided by an independent laboratory. Evaluations of the geol.og=iclhydrogeolocyie <br /> conditions at the site for the purpose of this investigation are made from a limited number of <br /> avaiiable data points (e.g. soil and ground water samples) and subsurface conditions may vary away <br /> from these data points. No other warranty, expressed or implied, is made as to the professional <br /> recommendations contained in this report. <br />